<div style="margin:15px auto;width:900px;  white-space: nowrap;  "><ul class="navigation" id="navmenu">    <li class='navigation'><a href="<?=base_url().'agent/'?>">Home</a></li>    <li class='navigation'><a href="<?=base_url().'client/'?>">Manage Client</a>        <ul id="sub1">            <li class='navigation'><a href="#">Photoshop</a></li>            <li class='navigation'><a href="#">Illustrator</a></li>        </ul>    </li>    <li class='navigation'><a href="#">Manage Ads</a></li>    <li class='navigation'><a href="#">Manage Schedules</a></li>    <li class='navigation'><a href="<?=base_url().'screen/'?>">Manage Screen</a></li>    <li class='navigation'><a href="<?=base_url().'login/logout'?>">Logout</a></li></ul></div>